Homeostasis

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  • Created by: nemoshea
  • Created on: 28-04-13 13:56
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  • homeostasis
    • blood sugar
      • too high
        • 1) detected by pancreas
        • 2) insulin released
        • 3) causes liver & cells to be permeable to glucose
        • 4) glucose stored as glycogen
      • too low
        • 1) detected by pancreas
        • 2) glucagon released
        • 3) causes liver & cells to break down glycogen into glucose
    • water & ions
      • 1) blood goes into the kidneys
      • 2) ultrafiltration: high pressure build up forcing water, ions & urea out of the blood through the membrane into bowman's capsule
      • 3) selective reapsorbtion: in the nephron, the needed ions & water is reapsorbed bu diffusion. Glucose absorbed by active transport also
      • 4) leftover substances end up in collecting duct then to bladder
    • temperature
      • too hot
        • hairs lie flat
        • sweat produced which evaporates from skin
        • blood vessels near skin dilate (easier for heat to transfer)
      • too cold
        • hairs stand up (to try to trap an insulating layer or air)
        • no sweat produced
        • blood vessels near skin constrict
        • start to shiver

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